Roasting or oxidizing furnace.



PATENTED AUG. '7, 1906.

G. E. DEWEY. ROASTING 0R OXIDIZING FURNACE.

APPLICATION FILED SEPT. 16, 1904.

e SHEETSSHEET 1.

HH'III will]! No. 828,095. PATENTED AUG. 7, 1906. 0. E. DEWEY. ROASTING OR OXIDIZING FURNACE.

APPLICATION FILED SEPT. 16. 1904.

b SHEETS-SHEET S.

Wmeom Q @22 alto 1mm vwewtoz W 6 SHBETSSHEHT 4.

PATENTED AUG. '7, 1906 G E DEWEY ROASTING OR OXIDIZINGPURNAGE. APPLICATION FILED SEPT. 16. 1904.

PATENTED AUG. 7, 1906. v

- APPLICATION FILED SEPT. 16. 1904.

6 SHEETSSHEET 5.

awoemtoz PATENTED AUG/7, 1906.

0. E. DEWEY. ROASTING OR OXIDIZIN-G FURNACE.

APPLICATION FILED SEPT,16, 1904.

6 SHEETSSHEET G.

i rili li lrw onanuosr n. DEWEY, or DENVER, COLORADO, Assumes Torus AiuERlCAN nvo AND essences coMrA Y, or .DENVER, COLO- .RADO.

No. sas es.

ROASTlNi-B on oxa oizieaeFuRNAoE.

- PatentedAugl 7,1 1

Application tiled September 16, 190a. Sarial l'llo- 224 710.

To all 1071/0710 itmrty concern:

Be it known that I, OHAUNGEY E. DEWEY, a citizen of the United States, residing in the city and county of Denver and State of Colora 0, have invented certain new and useful Improvements in Roasting or Oxidising Furnaces; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accom panying drawings, and to the letters and fig- .ures of reference marked thereon, whichform a part ofthis specification.

My invention relates to improvements in roasting-furnaces or furnaces adapted for use in roasting or oxidizing ores for the purpose of removing their refractory elements or impurities-such as sulfur, arsenic, and other elements-which render it diflicult to treat them for the separation of their metallic values.

Under the old practice it is found imdossible to thoroughly roast ore high in silica or not sufl ciently high in sulfur without supplying heat from a grate or other source independent of the combustible elements carried by the ore.

My invention relates to the treatment of this class of ore'sthat is to say, where the. silica is so high or the sulfur is combined with the metals in such a manner as to burn out w considerably during the earlier stage of the roasting, whereby not enough sulfur remains to supply heat by combustion with the oxygen of the air to finish the oxidizing process.

Myin-vention depends for its successupon the feeding of the ore into the-furnace atsuch a point as to take advantage ofthe excess or waste heat of the earlier stage of the roasting to suppiyi the reguiredhea't for finalroasting or cm on, an it is doneiby-having the finishinghearth above the hearth where the ore was first introduced, thus allowing the heat' from below to radiate through the finishinghearth to the ore or by directing the hot com bustion-gases from the chamber or furnace compartment where the ore was first introduced to the finishing cha1nberorcoinpart.

'me'nt through suitable flues and ports. "I also provide means for regulating gthejdraft, through the central hollow shafttoprevent undue. radiation i'roin fill S i-igdlearth greatest in; thenupper partofthefurnace b reason of the fact that the raworesuppliesa 431}, greater quantity of u'elwhen firs introduced 3 .thanat any subseq that as 'theaoiip mot rb cld'r'acti 8-,,

it name imjycssibnstog machine and to control in this way to a great'extent I the'temperature throughout the furnacef My improved furnace belongs tothe class. composed of a vertical cylinder. provided}. with hearths arranged within the cylinder one'above another and provided with a con-- trail -located hollow shaft,..withwhichthe- 6o rabb e-arms or the arms carrying the or stirrers are detaehably connected;

My improvement consists in constructing a furnace of'this class in such a manner that:

the raw ore is first introduced in the lower part of the furnace in order that this part of plows the furnace may be made and kept hottest. i

After the ore has passed through the lower part of-the furnace it is discharged into a.

bucket and elevated to the top of thefurna'ce. 7

and charged upon the uppermost hearth;

This furnace is so' constructed; thatlthe ore is gradually worked from the upper'tothe lower hearths in succession, the roasted ore.

being finally taken out of the furnace from' the hearth abovethat on which it was origioally charged. Assuming that the rawore is, introduced into the furnace upon the secend hearth om the lowermost, the ore be. finally taken out from the hearth immedir- 3O ately above.

uppermost hearth moves 'downwardl :the,

heat to which it is subjected is continua yin creasing, and this is as it should be, since after the ore is deprived of the greaterpart of 0 7 its sulfur, it is subjected to the heat generated. during the earlier stage of the operation, th satisfactorily desulfurizing.these ores out the, use of other fuel." In 0theI WOIidS;j;,. f.

according to'theold method or proces'slofop-f 5 crating this style of furnace the rawjcre ism troduced originally upon the u permost, 5 hearth; Hence thiheat resulting from combustionof the andother elements;

; he result r Meme- Hence by reason of'the intro? I :j duction of the raw ore into the lower partof les, whichare moved over the hearths and re toftravel'in op osite directions on any W6 {adjacent hearths that is to say, if it travels inwardly on an upper hearth it dro s downwardly through a central opening in t e .;hearth;t the central ortion of the hearth i'next below, from whicli it is gradually made to travel outwardly on the hearth and discharged through openings therein to the do? outerportion of the hearth next below, on hich it is again made to travel inwardly, and on,-thus taking a zi za course until the gfinishing-hearthis reac of, from which the ore is discharged in a completely roasted or oxidized condition. gfiaving briefly outlined my improved con- Situation, as well as the function it is intendd to perform, I will proceed to describe the t't e an in dmwin s, in which is,illus- "trated an embodiment thereof. the drawings, Figural is a side eleva- 1 nace equipped with my improve- 2 1S a Vertical section taken u'g face approximately on the e 2 2,1;Fl'g.;18 .*"Fi,g 3.1's a top. plan view of I i' Fig. 4 is a fragmentary vertical ctienof the furnace. Fig. 5 is a fragmen tary'sideelevation of the furnace, taken from 4e located at the right of Fig. 2. Fig. 6-1sa sectional view taken through the feed- .hopper, from which the raw ore is fed to the furnace,- the parts being shown ona larger scale. -Fig. 7 isa sectional view taken 5 through the hollow shaft, showing one of the rabble-arms in place, the parts being shown on a larger scale. Fig. 8 is a section taken on the line-8 8, Fi 7. Fig. 9 is a similar view Showing the ra ble-arm in a different posi- 5o tionfrom" that shown in Fig. 8. Fig. 10 is ,a detail .view' illustrating the bucket and "'bucket-carrier at its extreme upward limit of movement, A portion of the furnace is also shown in this view. Fig. 11 is a detail view 5 of the bucket-carrying mechanism viewed from a position at the right of Fig. 10, the bucket, owever, being shown in a lower position than in Fig. 10. Fig. 12 is a fragmentary side view of the furnace, showing the bucket and its carrier in a lower position than in Fig. 11 and in position to cause the bucketfilling chute to assume the inclined position asithe bucket continues its downward movement. 13 is a similar view showing the $5 bucket at its so'colistructed and arranged as to cause theamem detail, reference being made to thesee s chute in position to discharge into the bucket. Fig. 14 is a detail view of the lower part of the bucket-carrier track; together with the pivoted chute and its pendant.

The same reference characters same parts in all the views.

Let the numeral 5 designate the outer shell, and 6 the brick lining forming the vertical wall of the cylindrical body of the fur-' naee. This furnace is provided with a number .of.heartl1s located one above the other. If we designate the bottom or lowermost hearth as A, the other hearths may be desig nated A, A, A, A, and A respectively counting from the bottom-upwardly. It Wlll thus be observed that the bottom of the furnace forms the lowermost hearth; Above the uppermost hearth is a wall A, which may be said to constitute the top of the furnace. Through the center of this furnace, which is open for the purpose, extends a hollow shaft indicate the arms C, provided with plows or rabbles D. There are. two rabble-arms connected with this hollow shaft for each hearth of the-furnace, and the. plows or rabbles are so arranged as to cause the material on the hearths on any-two successive hearths, as heretofore explained. It will not benccessary to illustrate this feature in detail, since the rabbles of. all furnaces of this style or type are arranged in this manner. The sockets which receive therabble-arms are formed in pairs by inserting transversely in the hollow shaft Ba tube E, which is sre: l lest at the center and increases in diameter outwardly in both directions, forming two sockets. formed to fit these sockets. Near the outer extremity ofeaeh socket is formed a lu G, which occupies the lower part of the soc et. Each rabble-arm is shown at C, and the portion of the arm which enters the socket is provided with a lug G which when the arm is fully inserted in the socket of the hollon shaft occupies a position just inside of the lug G of the socket.

When it is desired to insert the rabble-arm in the socket, it is turned to the position shown in Fig. 9, which bri s the lug B of the arm just above the lug of the socket. This allows the rabble-arm to be inserted in the socket, its flat side being then on an incline, as shownin the said figure. After ins'ertion the rabble-arm is turned to bring its flat side in a horizontal position, or into the osition shown in Fig. 8, in which event the ug B of the arm occupies a position just inside of the lug G of the socket, and a'portion of the fiat side of the arm' rests on the upper horizontal edge of the lug G. (See Fig. 8.) This lug G hie-arm frornjmoving tion, and the travel of extreme lower position and the furnace is such that the'pressure of the ore B, provided with sockets adapted to receive Y to travel alternately inwardly and outwardly The rabble-arms C are flat on its lower side, as

Izoj

12 5 1 I forms a stop to prevent the rabfarther in that direcf the rabble-arms in the,

access 3m theplows serves to hold the rabble-arms in this positionthat is to say, whereby the flat sides of the arms are caused to engage the stops .6. The rabble-arm is thus securely held. in position and cannot be pulled: outwardly until it is given a partial rotation, whereby-it'is made to assume the position shown Fig. 9. In other words, the opcra 'tion of-removing the arm is exactly the reverse of inserting it.

To the lower extremity of the hollow shaft B is attached a gear 7, which meal. with a pinionv 8, fast on a shaft 9, journaled in a suitable support and provided at cuter trcmity with a worm-wheel 11, actuated by worm 12, whereby a comparatively slow rotary movement is imparted to hollow shaft and the rabble-arms connected therewith. I

The central 0 ening at the bot-tom of the furnace or'the owermcst hearth provided with a tubular lining l3, winch projects slightly above the upper surface of the hearth and cooperates with a cap 14, at-

' cooling purposes.

to pass upwardly from the lowermost chainber to the chamber next above. The chambers of this furnace named in. their ordr from the bottom to the top may be desiglisted 16, 17, 18, 19, 20, and 21, respectively.

From the chamber 17 there is no direct communication Wltlllil'lfi chamber 38. There is, however, an openingf21 at one side of the chamber 17, which. leads to a flue 22, formed in the wall of the furnace :at one side and ex. tending upwardly to the uppermost chamber of the uruace.v The top of this flue may be closedby a cover 23, which is removable. at pleasure. The flue 22- communicates withthe chamber 18 by means of an opening 24,

' through which the heat and products of combustion from the lower chambers of the furnace may be caused to enter the chamber 18 and pass, upwardly through the openin 15 in the center of the hearth A into the c am- .bc'r 19, from which the heat and roducts of combustion may pass through t e opening 25 to the chamber 20 and thence through the central opening 15' to the chamber 21, or the uppermost chamber of the furnace, from which point they may esca e through a fine 26, which leads to the stac (Not/shown.) The furnace me also be provided with an auxiliary outlet y way of an opening 27 at one sideof the uppermost chamber 21 to a flue 28, which, however, may be closed by a removable ca 29. Each of the hearths A and A, as well as the top A of the furnace, is provided with-means similar to that already described and designated 13 and 14 to prevent communication between the adjacent chambers around. the hollow shaft or between the uppermost chamber and the atn'icsphere. there. is nothing new, however, about this construction it need not be ex lained further in detail.

To the outer extremity of the shaft 9, be yond the worm-wheel 11, is made fast a sprockel whcel 30, which is connected, by

means of a chain 31, with a sprocket-wheel f2, mounted on spindle 33, suitably supported on the outer wall of the furnace. A hub 34 is directly and loosely mounted on the spindle 33, and the sprocket 32 is made fast to the said hub. The hub 34 is provided with a crank 35, in whose outer extremity is mad fast a pin 36, upon which two pulleys 37 are'loosely mounted. These pulleys are connected, by means of a cable 38, with two similar pulleys 39, loosely mounted on a spindie 40, secured to the outer wall of the furnace and at the top thereof. The cable 38. passes from the upper pulleys 39 over a guide-pulley 41, thence upwardly over another pulley 42, mounted on the upper extremity of a vertical track 43, upon which is slidably mounted a bucket-carrier 44, with which one extremity of the cable 38 is connected after leaving the pulley 42. The track 43 consists of two twin parts or membars 43, suitably separated, upon which is mounted the bucket-carrier 44, as aforesaid. This bucket-carrier is of skeleton construction and is provided with two separated members 44, bowed outwardly from the track and whose extremities 44 are shaped to fit the outer ed es otthe track and arranged to slide freely thereon. The two members 44 are connected by cross-pieces 44 and also by an upper cross-niece 44, to which the cable 38 is connected. By reason of the bowed construction of the bucket-carrier a suflicient space is formed between the track members and the parts 44 of the'carrier to make room for the bucket 45, which is pivotally connected with the frame at its outer vlower extremity, as shown at 46, whereby it is adapted to swing inwardly when permitted todo so by the track members 43. For the greater part'of their lengththe members 43 are of suflicient width to cause thebucket to occupy an upright position. When, however, it is raised to the. top of the furnace, or to the po'sitionshown in Fig. 10, it reaches a point of the track where-its members are cut away or recessed, as shown at 43, thus maloing the space between the two track menibers of sullicient width to allow the bucket to turn on its pivot 46 and. assume-the positionindicatedb y dotted lines in Fig. 10, whereby .und rstood that as the sproc its contents are discharged into an opening 47, formed in the upper part of the furnacewall and communicating with the uppermost chamber 21, whereby the ore to be treated is discharged upon the uppermost hearth A From the explanation just iven it will be l%et-chain 31 is actuated by the rotation of the shaft-9 the sprocket 32 will beset in motion and the crank 35 will be turned, the center of its pin 36, or that upon which the pulleys 37 are mounted, describin dotted circle 48. ur'ing this movement of the crank and the pulleys 37 from the uppermost to the lowermost point of their circular path it will be understood that the length of cable required to connect the two pulleys 37 with the two pulleys 39 will be increased sufficiently to draw the bucket carrier upwardl This construction is so arranged that c uring the travel of the pulleys 37 from the highest to the lowest point of their path the bucket-carrier will be drawn. from its lowermost to its 11 permost position, allowing the bucket to ump or assume the position indicated by dotted lines in Fig. 10, as heretofore explained, while during the movement of the pulleys 37 from the lowermo t point to the uppermost point of their pa i the bucket-carrier and the bucket will be allowed to descend from their uppermost to their lowermost osition.

At the outer e ge of the lowermost hearth, or that designated A in thedrawings, is formed an inclined passage 4-9, with which is connected a corres ondingly-inclined conduit 50, which cxten s somewhat below the bottom of uhe furnace and to whose lower 6X7 tremity is pivotally connected, as shown at 51, a chute 52, with which is connected a weight 53. Pivotally connected with the pivoted chute at its outer extremity, or that remote from the weight, as shown at 54, is a pendant 55, having a part 56 projecting outwardly at right angles to the arms of the pendant and located in the path of the bucket 45 as the latter descends. As the bucket moves downwardly the pivoted chute is n'v mally held by its weight 54 in its inactive position or in. position to close the lower extremity of the conduit 50. When, however, the bucket reachesthe position shown in Fig. 12, its bottom engages the part 56 of the pendant 55, and as the bucket and its carrier continue their downward movement the chute is thrown to the operative position shown in Fig. 13, whereby the contents of the conduit are allowedto discharge into the bucket 45, whereby the latter is filled or loaded. The bucket and its carrier then immediately begin their upward movement, and the, pivote chute 52 is allowed to reposition, (shown in Fig. 12,) as will be rea il understood.

sume its c6nduitciosim .between the track a path indicated by the.

and

.wardly into the chamber 17. 58 is journaled the shaft 60 of'a feed-screw door 73. 'As th tention is called to of the pendant is sufliciently narrow to pass carrier in its upward and downward movement has no action on the said pendant part; but the latter isacted on by the bucket during its downward movement, as heretofore explained. It will thus be understood that as the'bucket and its carrier move upwardly the pendant and the chute42 will be allowed to resume the position shown in Fig. 12'.

Thematerialto be treated isp a members 43, whereby the 1 cedina hopper 57, mounted on a cylindrical casing 58,.secured to the outer wal whose inner extremity communicates with an inclined passage 59, leading down- 61. This shaft protrudes from the casing, and upon one end thereof is mounted a ratchet-Wheel '62, which is fast thereon.

l of the furnace,

[In this casing Loosely mounted on the protruding exm:

tremityof the shaft is a de ending lever 63, whose upper extremity is ifurcated to e11- gage the shaftand straddle the ratchetwheel. This'lever is provided with a dog 64, which engages the ratchet-wheel and imparts an intermittent movement to the feed-screw i as the depending leverarm is oscillated; This lever 63 is slotted to receive one ex tremity of an arm 65, whose 0 tremity is fast on a vertical shat 66, journaled insuitable bearings mounted on the outer wall of the furnace. trem'ity of the shaft 66 is provided with a crank 67, which is connected with one extremity of a pitman 68, whose opposite extremity is connected with a disk 69 at a suitable point 70 outside of its center, whereby as the disk is rotated a reciprocating movement is imparted to the pitman and partial rotary movements in reverse directions to the shaft 66. As this shaft 66 is actuated it is evident that a corresponding movement will be given to the arm 65, which will impart an posite exr The lower ex-' IIO oscillating movement to the lever 63, whereby the feed-screw will be intermittently actuated, as heretofore explained. This movement of the feed-screw will discharge the ore into the chamber 17 of .thefurnaceg- The disk 69 is fast on one extfe'mit of-Ehe shaft 9.

The ore when completely roasted is discharged from the chamber 18 of the furnace through a passage 71, formed in the wall of the furnace and communicating with a chute 72, attached to the outer wall thereof. 'This roasted ore may be discharged i: an; nitable receptacle.

The outer wall of the furnace is provided with openings communicating with the several chambers. These openings are preferably arranged in a diagonal line, as shown in Fig 1, and each. is normally closed by a spective doors ese openings and their 're--* are arranged n daflerentiveb" ticalplanes, they are more convenient y The ore thus discharged into this chai fuel, since the sulfur-and other corner latter is made conveniently accessible to hopper 57 t0 the chamber 17, or the second the ra bles of the said chamber, sina falling upon cessible than if they were arran ed on rectly' above another, smce it is esirabii have a ladder for each openmg, whereby any travel of the ore on the hearth next ll be in a direction opposite that it traveled on the h th next own in the drawings, (see I. 2 is provided with at the topgnwhichdc "ierl'i the purpose the hirnace.

- erson or persons in charge of the furr f-thesedoors and their respective openi wereerranged one directly above anotb there would be considerable difficulty in 92.. i. ing access to them.

From the foregoing description the operation of my improved roasting or dizing furnace will be readily under-sh The ore to be treated is firstfed from the far K Under some cirhollon' shaft, if uiwbstructed, may have an undue cooling cii'ect upon the furnace. The 'i'um 'm oi the damper to regulate circumstances. if it conlbustio' chamber from the bottom of the inrna 3.

falls 11 on the hearth A and is acted r o. the

movement is imparted to the shaft l3 paratory to the commencement of cient to ignite the su fur and ct ties in the original charge of OI', lil1u one is continued without the further supp impurities of the ore aresuiiicient lil'qii to sustain the heat of the furnace. the hearth A is Worked by the action of the rabbles toward the center of the furnace and passes through the central opening 15 to the chamber 16 below. The ore in this chamber 16 also acted on by the rabbles, but is gradually pt worked outwardly and discharged by way oi 18 the conduit 50 into the chute 52 and thence into the bucket 45 as partially-roasted (-re. This ore is then carried upwardly in the bucket and discharged into the uppermost chamber of the furnace in'a manner here- W fore explained." Having reached the up 1 most chamber, or that designated in t drawings, the ore is radually worked tom" r the center of the rurnace and discharge throu h the opening 15 to the chamber 2 next below, in which it is acted on by rabbles and carried outwardly, being 6 2: charged to the chamber 39 tlnough cpen n' 25 in the outer edge of the heart e the inner wall of-the furnace. Vi bile one of these openin' 's is sho 21 11 in the ings,-a number will e used in practice. i ter the ore reaches the chamber 19 it is againcarried by the rabble mechanism toward the center of the furnace and discharged thror the opening 15: into the chamber 18, wher is again acted on by the rabblcs and carried outwardly, being discharged in a coinpler elyroasted condition through the outlet 71, as

as (ice ibed heretofore explained. 3. A of the class de- 7 Attention is called to the fact, as hereto scribed, v inlet for the raw fore intimated, that the ore may be 'fed either con'rv nicatmg' with one of its lower to the center or the outer edge the upper i chambers, the said chamber being provided of controllin the with a lateral outlet communicating with a perature.

4. A furnace of the class described provided with intercom municating chambers arranged one above another, the furnace having an inlet for the raw ore communicating with one of the lowerc'hambers, an outlet leading from its lowermost chamber, an inlet for the partially-roasted ore communicating with the uppermost chamber, a suitable track mounted outside of the furnace, a bucketcarrier mounted on said track, a bucket pivotally connected with said carrier, a chute connected with the outlet from the lowermost chamber of the furnace, a conduit regis tering with said outlet but with whose lower extremity the chute is pivotally connected, the chute being weighted to normally close the lower extremity of the conduit and providcd with a part located in the path of the bucket as the latter descends, whereby the chute is thrown downwardly to permit the ore to be discharged into the bucket, and suitable means for elevating the bucket and its carrier, the bucket being so connected. with the carrier that its tendency is to as sume the dumping position, the upper part of the track being cut away to allow the bucket to tip inwardly when it has been raised to a position to discharge into the iniet to the uppermost chamber of the furnace.

5. A furnace of the class described pro- Ivided' with an outlet communicating with one of its lower chambers, and an inlet communicating with one of its upper chambers, aconduit connected with the said outlet, a

. chute pivotally connected with the lower end of the conduit and weighted to cause it nor mally to occupy a position to close the lower extremity of the conduit, the said chute having a part projecting into the path of the bucket as the latter. dcscends,an upwardlyprojecting track, a carrier mounted to travel on the said track, a bucket located in said carrier and pivotally connected with the lat ter beyond its center whereby there is a tendency'oi the bucket to tip inwardly, the track being constructed to cause the bucket to assume an upright position except at its upper part where the track is cut away to allow the bucket to tip inwardly and discharge into the inlet communicating with the uppermost chamber. 1

6. In. a furnace of the class described, the combination of the body of the furnace pro- Vided with chambers arranged one above an- ,combination of' the furnace-body provided other, a vertical shaft centrally located in the furnace and arranged to rotate, rabble-arms connected with the said shaft and provided with'suitable lows or stirrers, a shaft suit ably journaled below the furnace,an opcrative gearin connection between the said shaft and tie rabble-arm shaft of the furnace, an upwardly-projecting track arranged outside of the furnace and consisting of two separated members, an outlet-conduitc0n1- municating with the lowermost chamber ofthe furnace and extending downwardl therefrom, a chute pivotally connected wit 1 the lower extremity of the conduit and weighted to cause it to occupy a position to close the lower extremity of theconduit, the said chute having a depending part pro'ecting into the space between the two mem ers of the track, a bucket-carrier slidably mounted on the track members, a bucket pivotally connected with said carrier whereby tl'iereus a tendency of the bucket to tip inwardly, the width of the bucket being such that during the greater part of its travel it engages the members of the track whereby it is prevented from tippin inwardly, the upper part of the track mem ers being cut away to'allow the bucket to tip inwardly when i it has reached a suitable elevation, and a suitable operating connection between the operatingshaft and the bucket-carrier whereby the lat-' ter is alternately raised and lowered, the part of the chute projecting into the space he tween the two members of the track, lying in the path of the bucket as the latter descends, whereby the chute is carried downwardlyto' allow the contents of the conduit to discharge into the bucket.

7. In a furnace of the class described, the

with a number of chambers arranged pne above another, a centrally-located vertlcal shaft mounted to rotate, rabble arms connected with the shaft and equipped with suiti able plows or stirrers, ahorizontal operating shaft located below the furnace, a gearin connection between the operating-shaft an the vertical shaft of the furnace, -suitable-,-

means for actuating the operating-shaft, a crank revolubly mounted on the outer wall of the furnace, a suitable operating connection between the said crank and the horizontal o crating-shaft whereby the crank is r0- tate a plurality of pulleys mounted on the said crank and ar'rangedto. travel therewith; corresponding pullcysniounted on the upper, part of the furnace, a cable connecting the two sets of pulleys, an upwardly-projecting track arranged outside the furnace, a bucketcarrier mounted on said track, the said cable 5 being connected with th: bucket-carrier,gand suitable guides for the cable between the up-* permost set of pulleys and the bucket-car rier.

8. In a furnace of the class described, the e-539 -IOO '- shaft ana;

outside of the furnace and consisting of .two separated members, an outlet-conduit communicating with-the lowermost chamber of 'the furnace and extending downwardly therefrom, a chute ,pivotally connected with the lower extremity of the conduit and weighted to cause it to occupy a position to close the lower extremity of the conduit, the said chute having a depending part pro'ecting into the space between. the two mem ers of the track, a bucket-carrier slidably mounted on the track members, a bucket pivotally in presence of connected with said carrier whereby there is a tendency of the bucket to tip inwardly, a guide to prevent the bucket from tip ing inwardly until it. has reached a suite le 'elevated point where the guide is constructed to connection sition, and a suitable operating b k the uc etbetween the o erating-shaft an I allow the bucketto assume the dumping pocarrier where y the latter is alternately raised and lowered, the part of the chute pro- 'ectin%into the space between the two men ers o bucket as the latter descends, whereby the chute is carried downwardly to allow the contents of the conduit to discharge into the bucket.

the track, lying in the path of the In testimony whereof I affix my signature 7 two witnesses.

. v GHAUNOEY EDEWEY.

Witnesses DENA NELSON, A. J. OBRIEN.

eel 

